Re: [linux-sunxi] [PATCH v6 05/13] drm/sun4i: abstract a engine type

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在 2017-05-05 10:56，Chen-Yu Tsai 写道：

On Thu, May 4, 2017 at 7:48 PM, Icenowy Zheng <icenowy@xxxxxxx> wrote:
As we are going to add support for the Allwinner DE2 engine in sun4i-drm 
driver, we will finally have two types of display engines -- the DE1
backend and the DE2 mixer. They both do some display blending and feed
graphics data to TCON, so I choose to call them both "engine" here.


These engines composite different layers into a final image which is
then sent out to the TCONs. As such, "compositor" would be an accurate
name.
However, "engine" is OK, since Allwinner calls this stuff Display Engine 
1.0 and 2.0. Hope there won't be a 3.0 ...
Maybe you should note that in your commit message. That is justifies the name.
Abstract the engine type to a new struct with an ops struct, which contains 
functions that should be called outside the engine-specified code (in
TCON, CRTC or TV Encoder code).

Signed-off-by: Icenowy Zheng <icenowy@xxxxxxx>
---
Changes in v6:
- Rebased on wens's multi-pipeline patchset.
- Split out Makefile changes.
Changes in v5:
- Really made a sunxi_engine struct type, and moved ops pointer
  into it.
- Added checked ops wrappers.
- Changed the second parameter of layers_init from crtc to engine.
Changes in v4:
- Comments to tag the color correction functions as optional.
- Check before calling the optional functions.
- Change layers_init to satisfy new PATCH v4 04/11.

 drivers/gpu/drm/sun4i/sun4i_backend.c |  68 ++++++++++++---------
 drivers/gpu/drm/sun4i/sun4i_backend.h |  17 +++---
 drivers/gpu/drm/sun4i/sun4i_crtc.c    |  11 ++--
 drivers/gpu/drm/sun4i/sun4i_crtc.h    |   4 +-
 drivers/gpu/drm/sun4i/sun4i_drv.c     |   2 +-
 drivers/gpu/drm/sun4i/sun4i_drv.h     |   2 +-
 drivers/gpu/drm/sun4i/sun4i_layer.c   |   8 +--
 drivers/gpu/drm/sun4i/sun4i_layer.h   |   5 +-
 drivers/gpu/drm/sun4i/sun4i_tcon.c    |  36 ++++++-----
 drivers/gpu/drm/sun4i/sun4i_tv.c      |   9 ++-
drivers/gpu/drm/sun4i/sunxi_engine.h | 112 ++++++++++++++++++++++++++++++++++ 
 11 files changed, 198 insertions(+), 76 deletions(-)
 create mode 100644 drivers/gpu/drm/sun4i/sunxi_engine.h
diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c 
index e53107418add..611cdcb9c182 100644
--- a/drivers/gpu/drm/sun4i/sun4i_backend.c
+++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
@@ -25,6 +25,8 @@

 #include "sun4i_backend.h"
 #include "sun4i_drv.h"
+#include "sun4i_layer.h"
+#include "sunxi_engine.h"

 static const u32 sunxi_rgb2yuv_coef[12] = {
        0x00000107, 0x00000204, 0x00000064, 0x00000108,
@@ -32,41 +34,38 @@ static const u32 sunxi_rgb2yuv_coef[12] = {
        0x000001c1, 0x00003e88, 0x00003fb8, 0x00000808
 };
-void sun4i_backend_apply_color_correction(struct sun4i_backend *backend) +static void sun4i_backend_apply_color_correction(struct sunxi_engine *engine) 
 {
        int i;

        DRM_DEBUG_DRIVER("Applying RGB to YUV color correction\n");

        /* Set color correction */
-       regmap_write(backend->regs, SUN4I_BACKEND_OCCTL_REG,
+       regmap_write(engine->regs, SUN4I_BACKEND_OCCTL_REG,
                     SUN4I_BACKEND_OCCTL_ENABLE);

        for (i = 0; i < 12; i++)
- regmap_write(backend->regs, SUN4I_BACKEND_OCRCOEF_REG(i), + regmap_write(engine->regs, SUN4I_BACKEND_OCRCOEF_REG(i), 
                             sunxi_rgb2yuv_coef[i]);
 }
-EXPORT_SYMBOL(sun4i_backend_apply_color_correction);
-void sun4i_backend_disable_color_correction(struct sun4i_backend *backend) +static void sun4i_backend_disable_color_correction(struct sunxi_engine *engine) 
 {
        DRM_DEBUG_DRIVER("Disabling color correction\n");

        /* Disable color correction */
-       regmap_update_bits(backend->regs, SUN4I_BACKEND_OCCTL_REG,
+       regmap_update_bits(engine->regs, SUN4I_BACKEND_OCCTL_REG,
                           SUN4I_BACKEND_OCCTL_ENABLE, 0);
 }
-EXPORT_SYMBOL(sun4i_backend_disable_color_correction);

-void sun4i_backend_commit(struct sun4i_backend *backend)
+static void sun4i_backend_commit(struct sunxi_engine *engine)
 {
        DRM_DEBUG_DRIVER("Committing changes\n");

-       regmap_write(backend->regs, SUN4I_BACKEND_REGBUFFCTL_REG,
+       regmap_write(engine->regs, SUN4I_BACKEND_REGBUFFCTL_REG,
                     SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS |
                     SUN4I_BACKEND_REGBUFFCTL_LOADCTL);
 }
-EXPORT_SYMBOL(sun4i_backend_commit);

 void sun4i_backend_layer_enable(struct sun4i_backend *backend,
                                int layer, bool enable)
@@ -81,7 +80,7 @@ void sun4i_backend_layer_enable(struct sun4i_backend *backend, 
        else
                val = 0;

-       regmap_update_bits(backend->regs, SUN4I_BACKEND_MODCTL_REG,
+ regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG, 
                           SUN4I_BACKEND_MODCTL_LAY_EN(layer), val);
 }
 EXPORT_SYMBOL(sun4i_backend_layer_enable);
@@ -144,27 +143,28 @@ int sun4i_backend_update_layer_coord(struct sun4i_backend *backend, 
        if (plane->type == DRM_PLANE_TYPE_PRIMARY) {
DRM_DEBUG_DRIVER("Primary layer, updating global size W: %u H: %u\n", 
                                 state->crtc_w, state->crtc_h);
-               regmap_write(backend->regs, SUN4I_BACKEND_DISSIZE_REG,
+ regmap_write(backend->engine.regs, SUN4I_BACKEND_DISSIZE_REG, 
                             SUN4I_BACKEND_DISSIZE(state->crtc_w,
                                                   state->crtc_h));
        }

        /* Set the line width */
DRM_DEBUG_DRIVER("Layer line width: %d bits\n", fb->pitches[0] * 8); - regmap_write(backend->regs, SUN4I_BACKEND_LAYLINEWIDTH_REG(layer), 
+       regmap_write(backend->engine.regs,
+                    SUN4I_BACKEND_LAYLINEWIDTH_REG(layer),
                     fb->pitches[0] * 8);

        /* Set height and width */
        DRM_DEBUG_DRIVER("Layer size W: %u H: %u\n",
                         state->crtc_w, state->crtc_h);
-       regmap_write(backend->regs, SUN4I_BACKEND_LAYSIZE_REG(layer),
+ regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYSIZE_REG(layer), 
                     SUN4I_BACKEND_LAYSIZE(state->crtc_w,
                                           state->crtc_h));

        /* Set base coordinates */
        DRM_DEBUG_DRIVER("Layer coordinates X: %d Y: %d\n",
                         state->crtc_x, state->crtc_y);
-       regmap_write(backend->regs, SUN4I_BACKEND_LAYCOOR_REG(layer),
+ regmap_write(backend->engine.regs, SUN4I_BACKEND_LAYCOOR_REG(layer), 
                     SUN4I_BACKEND_LAYCOOR(state->crtc_x,
                                           state->crtc_y));
@@ -185,7 +185,7 @@ int sun4i_backend_update_layer_formats(struct sun4i_backend *backend, interlaced = plane->state->crtc->state->adjusted_mode.flags 
                        & DRM_MODE_FLAG_INTERLACE;

-       regmap_update_bits(backend->regs, SUN4I_BACKEND_MODCTL_REG,
+ regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG, 
                           SUN4I_BACKEND_MODCTL_ITLMOD_EN,
interlaced ? SUN4I_BACKEND_MODCTL_ITLMOD_EN : 0);
@@ -199,7 +199,8 @@ int sun4i_backend_update_layer_formats(struct sun4i_backend *backend, 
                return ret;
        }
- regmap_update_bits(backend->regs, SUN4I_BACKEND_ATTCTL_REG1(layer), 
+       regmap_update_bits(backend->engine.regs,
+                          SUN4I_BACKEND_ATTCTL_REG1(layer),
                           SUN4I_BACKEND_ATTCTL_REG1_LAY_FBFMT, val);

        return 0;
@@ -232,13 +233,14 @@ int sun4i_backend_update_layer_buffer(struct sun4i_backend *backend, 
        /* Write the 32 lower bits of the address (in bits) */
        lo_paddr = paddr << 3;
DRM_DEBUG_DRIVER("Setting address lower bits to 0x%x\n", lo_paddr); - regmap_write(backend->regs, SUN4I_BACKEND_LAYFB_L32ADD_REG(layer), 
+       regmap_write(backend->engine.regs,
+                    SUN4I_BACKEND_LAYFB_L32ADD_REG(layer),
                     lo_paddr);

        /* And the upper bits */
        hi_paddr = paddr >> 29;
DRM_DEBUG_DRIVER("Setting address high bits to 0x%x\n", hi_paddr); - regmap_update_bits(backend->regs, SUN4I_BACKEND_LAYFB_H4ADD_REG, + regmap_update_bits(backend->engine.regs, SUN4I_BACKEND_LAYFB_H4ADD_REG, 
                           SUN4I_BACKEND_LAYFB_H4ADD_MSK(layer),
SUN4I_BACKEND_LAYFB_H4ADD(layer, hi_paddr));
@@ -330,6 +332,13 @@ static int sun4i_backend_of_get_id(struct device_node *node) 
        return ret;
 }

+static const struct sunxi_engine_ops sun4i_backend_engine_ops = {
+       .commit                         = sun4i_backend_commit,
+       .layers_init                    = sun4i_layers_init,
+ .apply_color_correction = sun4i_backend_apply_color_correction, + .disable_color_correction = sun4i_backend_disable_color_correction, 
+};
+
 static struct regmap_config sun4i_backend_regmap_config = {
        .reg_bits       = 32,
        .val_bits       = 32,
@@ -353,7 +362,8 @@ static int sun4i_backend_bind(struct device *dev, struct device *master, 
                return -ENOMEM;
        dev_set_drvdata(dev, backend);

-       backend->node = dev->of_node;
+       backend->engine.node = dev->of_node;
+       backend->engine.ops = &sun4i_backend_engine_ops;
        backend->id = sun4i_backend_of_get_id(dev->of_node);
        if (backend->id < 0)
                return backend->id;
@@ -363,11 +373,11 @@ static int sun4i_backend_bind(struct device *dev, struct device *master, 
        if (IS_ERR(regs))
                return PTR_ERR(regs);

-       backend->regs = devm_regmap_init_mmio(dev, regs,
- &sun4i_backend_regmap_config); 
-       if (IS_ERR(backend->regs)) {
+       backend->engine.regs = devm_regmap_init_mmio(dev, regs,
+ &sun4i_backend_regmap_config); 
+       if (IS_ERR(backend->engine.regs)) {
                dev_err(dev, "Couldn't create the backend regmap\n");
-               return PTR_ERR(backend->regs);
+               return PTR_ERR(backend->engine.regs);
        }

        backend->reset = devm_reset_control_get(dev, NULL);
@@ -415,18 +425,18 @@ static int sun4i_backend_bind(struct device *dev, struct device *master, 
                }
        }

-       list_add_tail(&backend->list, &drv->backend_list);
+       list_add_tail(&backend->engine.list, &drv->engine_list);

        /* Reset the registers */
        for (i = 0x800; i < 0x1000; i += 4)
-               regmap_write(backend->regs, i, 0);
+               regmap_write(backend->engine.regs, i, 0);

        /* Disable registers autoloading */
-       regmap_write(backend->regs, SUN4I_BACKEND_REGBUFFCTL_REG,
+ regmap_write(backend->engine.regs, SUN4I_BACKEND_REGBUFFCTL_REG, 
                     SUN4I_BACKEND_REGBUFFCTL_AUTOLOAD_DIS);

        /* Enable the backend */
-       regmap_write(backend->regs, SUN4I_BACKEND_MODCTL_REG,
+       regmap_write(backend->engine.regs, SUN4I_BACKEND_MODCTL_REG,
                     SUN4I_BACKEND_MODCTL_DEBE_EN |
                     SUN4I_BACKEND_MODCTL_START_CTL);
@@ -448,7 +458,7 @@ static void sun4i_backend_unbind(struct device *dev, struct device *master, 
 {
        struct sun4i_backend *backend = dev_get_drvdata(dev);

-       list_del(&backend->list);
+       list_del(&backend->engine.list);

        if (of_device_is_compatible(dev->of_node,
"allwinner,sun8i-a33-display-backend")) diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.h b/drivers/gpu/drm/sun4i/sun4i_backend.h 
index 6327a2985fe6..b022a37e8e5b 100644
--- a/drivers/gpu/drm/sun4i/sun4i_backend.h
+++ b/drivers/gpu/drm/sun4i/sun4i_backend.h
@@ -19,6 +19,8 @@
 #include <linux/regmap.h>
 #include <linux/reset.h>

+#include "sunxi_engine.h"
+
 #define SUN4I_BACKEND_MODCTL_REG               0x800
 #define SUN4I_BACKEND_MODCTL_LINE_SEL                  BIT(29)
 #define SUN4I_BACKEND_MODCTL_ITLMOD_EN                 BIT(28)
@@ -141,8 +143,7 @@
#define SUN4I_BACKEND_PIPE_OFF(p) (0x5000 + (0x400 * (p))) 

 struct sun4i_backend {
-       struct device_node      *node;
-       struct regmap           *regs;
+       struct sunxi_engine     engine;

        struct reset_control    *reset;

@@ -154,15 +155,13 @@ struct sun4i_backend {
        struct reset_control    *sat_reset;

        int                     id;
-
-       /* Backend list management */
-       struct list_head        list;
 };
-void sun4i_backend_apply_color_correction(struct sun4i_backend *backend); -void sun4i_backend_disable_color_correction(struct sun4i_backend *backend); 
-
-void sun4i_backend_commit(struct sun4i_backend *backend);
+static inline struct sun4i_backend *
+engine_to_sun4i_backend(struct sunxi_engine *engine)
+{
+       return container_of(engine, struct sun4i_backend, engine);
+}

 void sun4i_backend_layer_enable(struct sun4i_backend *backend,
                                int layer, bool enable);
diff --git a/drivers/gpu/drm/sun4i/sun4i_crtc.c b/drivers/gpu/drm/sun4i/sun4i_crtc.c 
index 708b3543d4e9..f8c70439d1e2 100644
--- a/drivers/gpu/drm/sun4i/sun4i_crtc.c
+++ b/drivers/gpu/drm/sun4i/sun4i_crtc.c
@@ -25,10 +25,9 @@

 #include <video/videomode.h>

-#include "sun4i_backend.h"
 #include "sun4i_crtc.h"
 #include "sun4i_drv.h"
-#include "sun4i_layer.h"
+#include "sunxi_engine.h"
 #include "sun4i_tcon.h"

 static void sun4i_crtc_atomic_begin(struct drm_crtc *crtc,
@@ -56,7 +55,7 @@ static void sun4i_crtc_atomic_flush(struct drm_crtc *crtc, 

        DRM_DEBUG_DRIVER("Committing plane changes\n");

-       sun4i_backend_commit(scrtc->backend);
+       sunxi_engine_commit(scrtc->engine);

        if (event) {
                crtc->state->event = NULL;
@@ -135,7 +134,7 @@ static const struct drm_crtc_funcs sun4i_crtc_funcs = { 
 };

 struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm,
-                                  struct sun4i_backend *backend,
+                                  struct sunxi_engine *engine,
                                   struct sun4i_tcon *tcon)
 {
        struct sun4i_crtc *scrtc;
@@ -146,11 +145,11 @@ struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm, 
        scrtc = devm_kzalloc(drm->dev, sizeof(*scrtc), GFP_KERNEL);
        if (!scrtc)
                return ERR_PTR(-ENOMEM);
-       scrtc->backend = backend;
+       scrtc->engine = engine;
        scrtc->tcon = tcon;

        /* Create our layers */
-       planes = sun4i_layers_init(drm, scrtc);
+       planes = sunxi_engine_layers_init(drm, engine);
        if (IS_ERR(planes)) {
                dev_err(drm->dev, "Couldn't create the planes\n");
                return NULL;
diff --git a/drivers/gpu/drm/sun4i/sun4i_crtc.h b/drivers/gpu/drm/sun4i/sun4i_crtc.h 
index 4dae3508424a..bf0ce36eb518 100644
--- a/drivers/gpu/drm/sun4i/sun4i_crtc.h
+++ b/drivers/gpu/drm/sun4i/sun4i_crtc.h
@@ -17,7 +17,7 @@ struct sun4i_crtc {
        struct drm_crtc                 crtc;
        struct drm_pending_vblank_event *event;

-       struct sun4i_backend            *backend;
+       struct sunxi_engine             *engine;
        struct sun4i_tcon               *tcon;
 };
@@ -27,7 +27,7 @@ static inline struct sun4i_crtc *drm_crtc_to_sun4i_crtc(struct drm_crtc *crtc) 
 }

 struct sun4i_crtc *sun4i_crtc_init(struct drm_device *drm,
-                                  struct sun4i_backend *backend,
+                                  struct sunxi_engine *engine,
                                   struct sun4i_tcon *tcon);

 #endif /* _SUN4I_CRTC_H_ */
diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c 
index 89c51fd6e9af..12ede8682b5c 100644
--- a/drivers/gpu/drm/sun4i/sun4i_drv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.c
@@ -101,7 +101,7 @@ static int sun4i_drv_bind(struct device *dev)
                goto free_drm;
        }
        drm->dev_private = drv;
-       INIT_LIST_HEAD(&drv->backend_list);
+       INIT_LIST_HEAD(&drv->engine_list);
        INIT_LIST_HEAD(&drv->tcon_list);

        ret = of_reserved_mem_device_init(dev);
diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.h b/drivers/gpu/drm/sun4i/sun4i_drv.h 
index 250c29017ef5..a960c89270cc 100644
--- a/drivers/gpu/drm/sun4i/sun4i_drv.h
+++ b/drivers/gpu/drm/sun4i/sun4i_drv.h
@@ -18,7 +18,7 @@
 #include <linux/regmap.h>

 struct sun4i_drv {
-       struct list_head        backend_list;
+       struct list_head        engine_list;
        struct list_head        tcon_list;

        struct drm_fbdev_cma    *fbdev;
diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.c b/drivers/gpu/drm/sun4i/sun4i_layer.c 
index e1f03e1cc0ac..ab33e4d06782 100644
--- a/drivers/gpu/drm/sun4i/sun4i_layer.c
+++ b/drivers/gpu/drm/sun4i/sun4i_layer.c
@@ -11,12 +11,10 @@
  */

 #include <drm/drm_atomic_helper.h>
-#include <drm/drm_crtc.h>
 #include <drm/drm_plane_helper.h>
 #include <drm/drmP.h>

 #include "sun4i_backend.h"
-#include "sun4i_crtc.h"
 #include "sun4i_layer.h"


You should also include sun4i_engine.h directly.



 struct sun4i_plane_desc {
@@ -130,10 +128,10 @@ static struct sun4i_layer *sun4i_layer_init_one(struct drm_device *drm, 
 }

 struct drm_plane **sun4i_layers_init(struct drm_device *drm,
-                                    struct sun4i_crtc *crtc)
+                                    struct sunxi_engine *engine)
 {
        struct drm_plane **planes;
-       struct sun4i_backend *backend = crtc->backend;
+ struct sun4i_backend *backend = engine_to_sun4i_backend(engine); 
        int i;
planes = devm_kcalloc(drm->dev, ARRAY_SIZE(sun4i_backend_planes) + 1, @@ -175,7 +173,7 @@ struct drm_plane **sun4i_layers_init(struct drm_device *drm, 

                DRM_DEBUG_DRIVER("Assigning %s plane to pipe %d\n",
i ? "overlay" : "primary", plane->pipe); - regmap_update_bits(backend->regs, SUN4I_BACKEND_ATTCTL_REG0(i), + regmap_update_bits(engine->regs, SUN4I_BACKEND_ATTCTL_REG0(i), SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL_MASK, SUN4I_BACKEND_ATTCTL_REG0_LAY_PIPESEL(plane->pipe));
diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.h b/drivers/gpu/drm/sun4i/sun4i_layer.h 
index 5ea5c994d6ea..004b7cfe8ffb 100644
--- a/drivers/gpu/drm/sun4i/sun4i_layer.h
+++ b/drivers/gpu/drm/sun4i/sun4i_layer.h
@@ -13,6 +13,8 @@
 #ifndef _SUN4I_LAYER_H_
 #define _SUN4I_LAYER_H_

+struct sunxi_engine;
+
 struct sun4i_layer {
        struct drm_plane        plane;
        struct sun4i_drv        *drv;
@@ -27,6 +29,5 @@ plane_to_sun4i_layer(struct drm_plane *plane)
 }

 struct drm_plane **sun4i_layers_init(struct drm_device *drm,
-                                    struct sun4i_crtc *crtc);
-
+                                    struct sunxi_engine *engine);


Please keep the newline.


 #endif /* _SUN4I_LAYER_H_ */
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c 
index 29fd829aa54c..c48135a10fda 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -26,12 +26,12 @@
 #include <linux/regmap.h>
 #include <linux/reset.h>

-#include "sun4i_backend.h"
 #include "sun4i_crtc.h"
 #include "sun4i_dotclock.h"
 #include "sun4i_drv.h"
 #include "sun4i_rgb.h"
 #include "sun4i_tcon.h"
+#include "sunxi_engine.h"


Please keep the headers in alphabetical order.


sunxi is of course after sun4i.





 void sun4i_tcon_disable(struct sun4i_tcon *tcon)
 {
@@ -488,12 +488,16 @@ struct drm_bridge *sun4i_tcon_find_bridge(struct device_node *node) 
  * means maintaining a large list of them. Or, since the backend is
  * registered and binded before the TCON, we can just go through the
  * list of registered backends and compare the device node.
+ *
+ * As the structures now store engines instead of backends, here this
+ * function in fact searches the corresponding engine, and the ID is
+ * requested via the get_id function of the engine.
  */
-static struct sun4i_backend *sun4i_tcon_find_backend(struct sun4i_drv *drv, +static struct sunxi_engine *sun4i_tcon_find_engine(struct sun4i_drv *drv, struct device_node *node) 
 {
        struct device_node *port, *ep, *remote;
-       struct sun4i_backend *backend;
+       struct sunxi_engine *engine;

        port = of_graph_get_port_by_id(node, 0);
        if (!port)
@@ -504,21 +508,21 @@ static struct sun4i_backend *sun4i_tcon_find_backend(struct sun4i_drv *drv, 
                if (!remote)
                        continue;

-               /* does this node match any registered backends? */
- list_for_each_entry(backend, &drv->backend_list, list) { 
-                       if (remote == backend->node) {
+               /* does this node match any registered engines? */
+               list_for_each_entry(engine, &drv->engine_list, list) {
+                       if (remote == engine->node) {
                                of_node_put(remote);
                                of_node_put(port);
-                               return backend;
+                               return engine;
                        }
                }

                /* keep looking through upstream ports */
-               backend = sun4i_tcon_find_backend(drv, remote);
-               if (!IS_ERR(backend)) {
+               engine = sun4i_tcon_find_engine(drv, remote);
+               if (!IS_ERR(engine)) {
                        of_node_put(remote);
                        of_node_put(port);
-                       return backend;
+                       return engine;
                }
        }
@@ -530,13 +534,13 @@ static int sun4i_tcon_bind(struct device *dev, struct device *master, 
 {
        struct drm_device *drm = data;
        struct sun4i_drv *drv = drm->dev_private;
-       struct sun4i_backend *backend;
+       struct sunxi_engine *engine;
        struct sun4i_tcon *tcon;
        int ret;

-       backend = sun4i_tcon_find_backend(drv, dev->of_node);
-       if (IS_ERR(backend)) {
-               dev_err(dev, "Couldn't find matching backend\n");
+       engine = sun4i_tcon_find_engine(drv, dev->of_node);
+       if (IS_ERR(engine)) {
+               dev_err(dev, "Couldn't find matching engine\n");
                return -EPROBE_DEFER;
        }
@@ -546,7 +550,7 @@ static int sun4i_tcon_bind(struct device *dev, struct device *master, 
        dev_set_drvdata(dev, tcon);
        tcon->drm = drm;
        tcon->dev = dev;
-       tcon->id = backend->id;
+       tcon->id = sunxi_engine_get_id(engine);
        tcon->quirks = of_device_get_match_data(dev);

        tcon->lcd_rst = devm_reset_control_get(dev, "lcd");
@@ -589,7 +593,7 @@ static int sun4i_tcon_bind(struct device *dev, struct device *master, 
                goto err_free_dotclock;
        }

-       tcon->crtc = sun4i_crtc_init(drm, backend, tcon);
+       tcon->crtc = sun4i_crtc_init(drm, engine, tcon);
        if (IS_ERR(tcon->crtc)) {
                dev_err(dev, "Couldn't create our CRTC\n");
                ret = PTR_ERR(tcon->crtc);
diff --git a/drivers/gpu/drm/sun4i/sun4i_tv.c b/drivers/gpu/drm/sun4i/sun4i_tv.c 
index 542da220818b..a9cad00d4ee8 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tv.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tv.c
@@ -22,10 +22,10 @@
 #include <drm/drm_of.h>
 #include <drm/drm_panel.h>

-#include "sun4i_backend.h"
 #include "sun4i_crtc.h"
 #include "sun4i_drv.h"
 #include "sun4i_tcon.h"
+#include "sunxi_engine.h"

 #define SUN4I_TVE_EN_REG               0x000
 #define SUN4I_TVE_EN_DAC_MAP_MASK              GENMASK(19, 4)
@@ -353,7 +353,6 @@ static void sun4i_tv_disable(struct drm_encoder *encoder) 
        struct sun4i_tv *tv = drm_encoder_to_sun4i_tv(encoder);
struct sun4i_crtc *crtc = drm_crtc_to_sun4i_crtc(encoder->crtc); 
        struct sun4i_tcon *tcon = crtc->tcon;
-       struct sun4i_backend *backend = crtc->backend;

        DRM_DEBUG_DRIVER("Disabling the TV Output\n");
@@ -362,7 +361,8 @@ static void sun4i_tv_disable(struct drm_encoder *encoder) 
        regmap_update_bits(tv->regs, SUN4I_TVE_EN_REG,
                           SUN4I_TVE_EN_ENABLE,
                           0);
-       sun4i_backend_disable_color_correction(backend);
+
+       sunxi_engine_disable_color_correction(crtc->engine);
 }

 static void sun4i_tv_enable(struct drm_encoder *encoder)
@@ -370,11 +370,10 @@ static void sun4i_tv_enable(struct drm_encoder *encoder) 
        struct sun4i_tv *tv = drm_encoder_to_sun4i_tv(encoder);
struct sun4i_crtc *crtc = drm_crtc_to_sun4i_crtc(encoder->crtc); 
        struct sun4i_tcon *tcon = crtc->tcon;
-       struct sun4i_backend *backend = crtc->backend;

        DRM_DEBUG_DRIVER("Enabling the TV Output\n");

-       sun4i_backend_apply_color_correction(backend);
+       sunxi_engine_apply_color_correction(crtc->engine);

        regmap_update_bits(tv->regs, SUN4I_TVE_EN_REG,
                           SUN4I_TVE_EN_ENABLE,
diff --git a/drivers/gpu/drm/sun4i/sunxi_engine.h b/drivers/gpu/drm/sun4i/sunxi_engine.h 
new file mode 100644
index 000000000000..b3c6e6148568
--- /dev/null
+++ b/drivers/gpu/drm/sun4i/sunxi_engine.h
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2017 Icenowy Zheng <icenowy@xxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ */
+
+#ifndef _SUNXI_ENGINE_H_
+#define _SUNXI_ENGINE_H_
+
+struct sun4i_crtc;


This is not used. Please remove it.
The rest looks good. Thanks for working this out. Once the minor comments 
are fixed, please add my

Reviewed-by: Chen-Yu Tsai <wens@xxxxxxxx>


+struct drm_plane;
+struct drm_device;
+
+struct sunxi_engine;
+
+struct sunxi_engine_ops {
+       void (*commit)(struct sunxi_engine *engine);
+       struct drm_plane **(*layers_init)(struct drm_device *drm,
+ struct sunxi_engine *engine); 
+
+       void (*apply_color_correction)(struct sunxi_engine *engine);
+       void (*disable_color_correction)(struct sunxi_engine *engine);
+       int (*get_id)(struct sunxi_engine *engine);
+};
+
+/**
+ * struct sunxi_engine - the common parts of an engine for sun4i-drm driver 
+ * @ops:       the operations of the engine
+ * @regs:      the regmap of the engine
+ */
+struct sunxi_engine {
+       const struct sunxi_engine_ops   *ops;
+
+       struct device_node              *node;
+       struct regmap                   *regs;
+
+       /* Engine list management */
+       struct list_head                list;
+};
+
+/**
+ * sunxi_engine_commit() - commit all changes of the engine
+ * @engine:    pointer to the engine
+ */
+static inline void
+sunxi_engine_commit(struct sunxi_engine *engine)
+{
+       if (engine->ops && engine->ops->commit)
+               engine->ops->commit(engine);
+}
+
+/**
+ * sunxi_engine_layers_init() - Create planes (layers) for the engine
+ * @drm: pointer to the drm_device for which planes will be created 
+ * @engine:    pointer to the engine
+ */
+static inline struct drm_plane **
+sunxi_engine_layers_init(struct drm_device *drm, struct sunxi_engine *engine) 
+{
+       if (engine->ops && engine->ops->layers_init)
+               return engine->ops->layers_init(drm, engine);
+       return ERR_PTR(-ENOSYS);
+}
+
+/**
+ * sunxi_engine_apply_color_correction - Apply the RGB2YUV color correction 
+ * @engine:    pointer to the engine
+ *
+ * This functionality is optional for an engine, however, if the engine is 
+ * intended to be used with TV Encoder, the output will be incorrect
+ * without the color correction, due to TV Encoder expects the engine to 
+ * output directly YUV signal.
+ */
+static inline void
+sunxi_engine_apply_color_correction(struct sunxi_engine *engine)
+{
+       if (engine->ops && engine->ops->apply_color_correction)
+               engine->ops->apply_color_correction(engine);
+}
+
+/**
+ * sunxi_engine_disable_color_correction - Disable the color space correction 
+ * @engine:    pointer to the engine
+ *
+ * This function is paired with apply_color_correction().
+ */
+static inline void
+sunxi_engine_disable_color_correction(struct sunxi_engine *engine)
+{
+       if (engine->ops && engine->ops->disable_color_correction)
+               engine->ops->disable_color_correction(engine);
+}
+
+/**
+ * sunxi_engine_get_id - Get the ID of the engine.
+ * @engine:    pointer to the engine
+ *
+ * If the ID is not necessary, just do not implement it in sunxi_engine_ops, 
+ * and a default -1 will be returned.
+ */
+static inline int
+sunxi_engine_get_id(struct sunxi_engine *engine)
+{
+       if (engine->ops && engine->ops->get_id)
+               return engine->ops->get_id(engine);
+
+       return -1;
+}
+#endif /* _SUNXI_ENGINE_H_ */
--
2.12.2

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